As the title explains it, I have Kn2222A x2 transistors connected as a Darlington pair connected at the ground side of a [JQC-3F (T73) 5v] relay
The relay is connected to a 5v power supply.
the problem is, when I feed the base of the Darlington pair with low current, it won't switch the relay, it seems that the minimum current needed for the base is 0.3mA, less than that won't do a thing, looking at the data-sheet I should get at least 100*100 gain, 10000 * 0.3mA = 3A I am sure that's more than enough for the relay, unless I am missing something
I'm having hard time getting Hfe from the datasheet, and knowing the amp needed by the relay. Transistor datasheet
another question is, can the relay function at higher than 5volts? (safely)
I'm only experiencing with electronics so any more info will be appreciated